If you cast a Rhystic Study, you get to your win conditions and answers quicker, all while barely spending much mana to actually cast it
Why Chromium: Because he's Batman
But electing to narrow your own card pool can also be rewarding, unlocking a second pool of synergies around whatever specific type of non-creature spells you specialize in
Theres a lot of arguments about whether or not MTG should be an investment (it shouldnt be, its just an expensive hobby), but those arguments shouldnt result in an obnoxiously expensive box of cardboard
Mana Vault Games is well-regarded for its extensive inventory of both popular and rare items, making it a must-visit for anyone in the area
Choosing Rangers Guile, Giant Growth, and Fog, that fills my nine cards for the deck